Its 2008 annual report provides a comprehensive analysis of the "state of congestion" in 2008 across America and how it changed versus 2007. Leveraging tens of billions of GPS data points from vehicles traveling across 47,000 miles of major roadways of urban America, INRIX analysis produced a 130+ page report ranking the top 100 worst congested metropolitan areas and providing details on the worst traffic bottlenecks.

WJLA TV-7 reports, however, that this year's 5th spot is actually an improvement over the area's ranking at number four in 2007. The report says that the traffic in D.C. has actually decreased by more than 25 percent since 2007.
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